WideStudio is an Integrated Development Environment (IDE) for building window applications in C++, Ruby, Python an Perl for Windows, MacOSX, Linux, FreeBSD, SOLARIS and other unix and BTRON and T-Engine. This is open and free (under MIT/X Consortiun Lice

Support for the Oasis XRI (Extensible Resource Identifiers) effort. This includes resolvers and client libraries for XRIs in multiple languages and multiple platforms. See http://www.oasis-open.org/committees/xri

palbum is a perl script which turns a directory (or directory hierarchy) full of images into a nice image gallery. It generates thumbnails and index.html files, and requires no configuration. It uses the ubiquitous netpbm library for image processing.

Compares two values of any type and structure and returns true if they are the same.
It does a deep comparison of the structures, so a hash of a hash of a whatever will be
compared correctly. This is especially useful for writing unit tests!

Lamia or Lamia Engine is the modern generation free distributable and open source game engine for creating computer games for several prevailing software platforms and very maybe hardware platforms either.